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Dallas Cowboys defensive coordinator Rob Ryan, left, shakes hands with country singer Toby Keith before an NFL football game against the Dallas Cowboys Sunday, Sept. 11, 2011, in East Rutherford, N.J. (AP Photo/Julio Cortez)

Dallas Cowboys defensive coordinator Rob Ryan, left, shakes hands with country singer Toby Keith before an NFL football game against the Dallas Cowboys Sunday, Sept. 11, 2011, in East Rutherford, N.J. (AP Photo/Julio Cortez)

9/11 sports tributes

January 1, 1970

The sports world paid tribute to the 10th anniversary of the 9/11 attacks.